Compeessok for molding machines



A. NL JN commsso Fora Mamme miei'rms 4 Nov. 20, 1923.

ATTORNEYS.

Patented Nov. zo, 1923.

Unirsowsia'ras tirati? ALFRED M. JONES, 0F MILWAUKEE, ISVCVONSN'.V

COMPRESSOR Foa MOLDING MacHrnns. g

' Application filed-February 10, 1921. Serial No. 443,824.V

To all whom 'it may concern:

Be it known that I, ALFRED M. JoNns, a citizen of the United States, residingat Milwaukee,V county ofV Milwaukee, and State of Wisconsin, have invented new and useful vImprovements in ACompressors for Molding Machines, of which the following isa specification.

This invention relates to compressors for molding machines.

Objects of this invention are to provide a power operated compressor for packing the sand into a relatively stationary mould supported below such packer', and to provide a packer which may be readily swung from above the mould laterally to a position so as to have the space above the mould unobstructed. f

Further objects areto provide av packer which may be permanently secured inposition but which is adjustable to accommodate variations in the height of either the mould or of the support for the mould; to provide means for preventingthe bottom plate or platen' from yn'ioving out of correct position; and to provide means for temporarily latching the packer in its yretracted position.

Further objects are to provide a pneumatic packer for Vmoulds which may be manuallyl controlled; which may be moved from operative position; and which willv be retained in retracted position independently of the supply of compressed air. y

1' An embodiment ofthe invention is shown Ais a piston 3 having an integral, hollow stem 4 which projects outwardly thru" the bottom cylinder head. A packingf may be provided within ya threaded recessed portion ofthe cylinder head .2, such packing being compressed by a gland nut 6 so as to provide the usual airtight joint between the piston and cylinder.

The' piston 'rod is extensible sothat they a machine emdistance between the platen 16 and the lpis-'i ton 3 may be varied to accommodate variations 'in the height `of either the mouldor Vflask or of the supporting table. The stem 4 is hollow and internally threaded and receives a correspondingly threaded solid rodY 13. This rod 13` lis locked'in adjusted position with reference tothe stem' 4 by means of a locknut 14. "lhebott-om portion of the rod 13 is rounded'as indica-ted at 7 and tits a. correspondingly rounded socket within the hub' 15er the platen 16. v`A bolt 17 passes thru the hub l5V and thru an opening 8 in the rod 13. lt will be noted that the opening 8 is flared at its ends so that a jointed connection is-provided between the rod 13 and the platen 16 allowing the platen to float and accommodate itself to varying Y angular relations between the piston rod and the plane of the flask. It is to be noted that when a great pressure is exerted upon the platen that the supporting mechanism for the cylinder will spring and allow a slight angular change to takefplace between the axis of the piston rod and the plane of the ask. The float-ing platen Yaccommodates itself to these changes.

' Means are provided for retaining the piston in its elevated position independently ofthe air pressure so'that if, for any reason, the air pressure should fail the piston will `still be retained in its elevated position.

j Figure 4 illustrates in detail one of the fastening ldevices for temporarily latching the piston in elevated position, these latches 9 and 10 being shown in Figure'l'in the posi` tion they occupy withre'spect tothe cylinder@ It' maybe found* advantageous to apply one upon each side of the piston. The latch'vcomprises a cylindricalV member threaded into'the cylinder atf`32. It carries a plunger33 which has a reducedV rear portion 34 to properlyposition a spring 35 such spring tending toV press the plunger outwardly. vThe plunger is prevented from 'passing completely out of the cylindrical i 11 whichy is closed at its outer end 12 and is member 1 by means of a pin 36 'which passes Y thru the cylindrical member and thru an elongated slot formed in the plunger. The outer end of the plunger is conical or beveled as indicated at 37 and vcooperates with a corresponding groove formed in the upper portion of the piston. It will be seen that when the piston is in elevated position that the plungers snap into the groove and will retain the piston independently of the airl pressure. j

The platen may comprise a flat plate corresponding in outline roughly to the inner area of the iiask. lt is provided with a substantially centrally positioned boss 15 previously described and with fa rear boss 19. 'lhisrearboss is adapted to receivega rod i8 which by means of a screw 20 may be.

locked in position. The rod 18 passes upwardly thru a hole termed in the support-` ing framework and serves to prevent inadvertent rotation of the platen. I

The cylinder l has formed 'ntegrally therewith a pair ofreaiwardly extending arms 2lY -and 22 which may conveniently be reentorced by a connecting web 23. rlhesearms terminate in bearingor journal members 2d andl 2o. Between these journal members is positioned the rigidly mountedsupport 2G which is provided with corresponding bearings or journal members 27 `and 28. 'A pin 29 pivotally connects the stationary and movable portions and is provided with an enlarged head 3() to prevent such pin from falling downwardly out oliv position. y .The bracket 26 may conveniently be carried upon an -bea-ml whichit is contemplated lurf nishing with the machine so that the l-beam may be bolted upon any suitable wall or other support and may be sold as a unitary Yon to a corresponding boss projecting upwardly from the laterally extending portion 40. This cap acts as a coupling member ior a flexible hose 45 which furnishes the com pressed air or other` compressed lfluid for operatingV the device. The valve is so formed that, by the rotation of the handle 44 thru a 'fractional part or its path, ainmay be admitted either above or below the pistoni A further rotation of the handle serves to out the air off from both upper and lowerr parts ol' the cylinder. It is to be noted that the air pressure tends to seat the valve and thereby prevents leakage.

lt will be seen that a power operated compresser torflasks or moulds has been provided, which isv conveniently controlled by manual mea-ns, which may be quickly and readily operated to compress the sand in Y the mould. lt will be noted that a relatively small cylinder supplied with the air at a reasonablepressure mayexert a very said piston in its retracted position.4

great force upon the platen and at one stroke completely compress or pack the sand into place. It will also be seen that the entire device may be swung about the pivot pin 29 laterally out of the way of the mould so that the mould may be lifted directly upwardly and the space above such mould may remain vunobstructed,until it, is again desired to use the device.

I claim: l. ln a compressor for moulds, the combination with a cylinder provided with a rthreaded aperture adjacent its upper end,

Y of a piston provided with an annular groove' adjacent its yupper end, a hollow cylindrical membery engaging the cylinder in said aperture ,said member having one end closed andv the Aother end open to said cylinder, a pin within said member provided with a-,conical i end adapted to engage saidfannular groove, means for limiting the axial movement of said pin, and a spring disposed between said pin andthe closed end of said memberand adapted to actuate said piny outwardly of' said member, whereby said piston will be automatically retained in its retracted position irrespective of the fluid supply. v

2. In a compressor formoulds, the combination with a cylinder, of a piston havingv an integral hollow stem, a rod adjustably engaging said stemmeans for locking said rod to said'stem in any one of a plurality of positions, a platen carried bysaid rod, and means upon said cylinder adapted to engage 3. In a compressor for moulds,-the combination with a cylinder, of a' piston having an eXtensible rod provided with a rounded end and transverse'hole adjacent said end, saidfhole havingiiared ends, a platen, a lug integral with said platen provided with a hole adapted to receive 'therounded end of said rod, and a bolt transversely of said lug adapted to be` receivedY in the hole in said rod, whereby saidplaten .may Jfreely adjust itself angularly relative to said rod.

4. In a compressor for moulds,athe combination with a cylinder, ofv a piston provided` with an extensible rod, ,a platen carried by said rod, means securing said platen to *said rod, said means being adapted lto permit said platen to adjust itself angularly relative to the rod, a second rodpivotally secured tosaid` platen and adapted to prevent rotation thereof.

5. In a compressor for moulds, the combination with ya cylinder, of a piston, Va platen carried by said piston, means adapted to permit said platen to adjust itself angularly relative to saidy piston, arms integral with said cylinder, a bracket, a pin adapted to pivotally secure said arms to said bracket, a rodslidab'ly secured to said cylinder and pivotally engaging said platen, and means upon said cylinder adapted to retain the pisiio ton in retractedl position independently of fluid or air pressure.

6. A ycompressor for a mould comprising a cylinder, a piston mounted therein, manual means for controlling the supply of a compressed fluid to said cylinder to thereby control the operation of said piston, a piston rod extending outwardly thru said cylinder carried by said piston, and a platen mounted for free angular adjustment relative to said pist-on rod and carried by said piston rod.

7. In a moulders press, the combination with a bracket having relatively fixed and movable portions, of a vreoiprooable press plunger sup orted from the movable portion of said brac et, a motor supported from said movable bracket portion and operatively `connected with said plunger, means for supplying power to said motor, and a controlling device for said power supplying means, said device being mounted for movement with said plunger and said motor in accordance with the movements of said movable bracket portion, whereby said device will always be accessible tol an operator following the movements of said plunger, motor, and

bracket portion.

ALFRED M. JONES. 

